Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
Angew Chem Int Ed Engl. 2018 Apr 3;57(15):4098-4102. doi: 10.1002/anie.201800671. Epub 2018 Mar 13.
Cyclic diboranes(4) based on a chelating monoanionic benzylphosphine linker were prepared through boron-silicon exchange between arylsilanes and B Br . Coordination of Lewis bases to the remaining sp boron atom yielded unsymmetrical sp -sp diboranes, which were reduced with KC to their corresponding trans-diborenes. These compounds were studied with a combination of spectroscopic methods, X-ray diffraction, and DFT calculations. PMe -stabilized diborene 6 was found to undergo thermal rearrangement to gem-diborene 8. DFT calculations on 8 reveal a polar boron-boron bond, and indicate that the compound is best described as a borylborylene.
基于螯合单阴离子苄基膦配体的环状二硼烷（4）通过芳基硅烷和 BBr3 之间的硼硅交换制备。路易斯碱与剩余的 sp 硼原子配位得到不对称的 sp-sp 二硼烷，然后用 KC 将其还原为相应的反式二硼烯。这些化合物通过光谱方法、X 射线衍射和 DFT 计算的组合进行了研究。发现 PMe 稳定的二硼烯 6 会经历热重排生成偕二硼烯 8。对 8 的 DFT 计算表明存在极性硼-硼键，并表明该化合物最好被描述为硼亚硼烯。
